OBD-II code · Powertrain (generic)
P0379 Timing Reference High Resolution Signal B No Pulses
No pulses detected on timing reference signal B — open circuit, dead sensor, or air gap too wide.
Is it safe to drive with P0379?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor or wiring open
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Camshaft Position Sensor
Related codes
- P0374Timing Reference High Resolution Signal A No Pulses
- P0376Timing Reference High Resolution Signal B Too Many Pulses
- P0377Timing Reference High Resolution Signal B Too Few Pulses
- P0378Timing Reference High Resolution Signal B Intermittent/Erratic Pulses
- P037AGlow Plug/Heater Indicator Control Circuit Low
- P037BGlow Plug/Heater Indicator Control Circuit High
- P037CCold Start Camshaft Profile System Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.